What is the Square Footage Calculator?
Calculate square feet of a room or space, plus square meters and cost. Order the right amount the first time. These construction and DIY calculators estimate materials for common home projects and include sensible waste allowances.
How to use the Square Footage Calculator
- Enter your length, your width, your price per ft².
- Results update automatically as you type; you can also press Calculate.
- Read the output: square feet, square meters, square yards, total cost.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With length = 20 ft, width = 15 ft, price per ft² = $0, the Square Footage Calculator returns square feet: 300.00 ft²; square meters: 27.871 m²; square yards: 33.333 yd².
Tips for better results
- Add 5–15% for waste, cuts and breakage depending on the material.
- Measure twice and round up when buying — returns are easier than second trips.
- Coverage figures vary by product, so check the label or spec sheet.
⚠️ Material estimates are approximate. Follow local building codes and manufacturer instructions.
Frequently asked questions
What does the Square Footage Calculator do?
Calculate square feet of a room or space, plus square meters and cost.
How is it calculated?
The Square Footage Calculator uses this method: ft² = Length × Width.
Can you show an example?
With length = 20 ft, width = 15 ft, price per ft² = $0, the Square Footage Calculator returns square feet: 300.00 ft²; square meters: 27.871 m²; square yards: 33.333 yd².
Is the Square Footage Calculator accurate?
It uses standard published formulas and is tested against known values, but results are estimates for guidance. Material estimates are approximate. Follow local building codes and manufacturer instructions.
Is this tool free and private?
Yes — the Square Footage Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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